media/libopus/silk/decode_parameters.c@b8a032363ba2 (annotated)
media/libopus/silk/decode_parameters.c
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /*********************************************************************** |
| michael@0 | 2 | Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| michael@0 | 3 | Redistribution and use in source and binary forms, with or without |
| michael@0 | 4 | modification, are permitted provided that the following conditions |
| michael@0 | 5 | are met: |
| michael@0 | 6 | - Redistributions of source code must retain the above copyright notice, |
| michael@0 | 7 | this list of conditions and the following disclaimer. |
| michael@0 | 8 | - Redistributions in binary form must reproduce the above copyright |
| michael@0 | 9 | notice, this list of conditions and the following disclaimer in the |
| michael@0 | 10 | documentation and/or other materials provided with the distribution. |
| michael@0 | 11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the |
| michael@0 | 12 | names of specific contributors, may be used to endorse or promote |
| michael@0 | 13 | products derived from this software without specific prior written |
| michael@0 | 14 | permission. |
| michael@0 | 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| michael@0 | 16 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| michael@0 | 17 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| michael@0 | 18 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| michael@0 | 19 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| michael@0 | 20 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| michael@0 | 21 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| michael@0 | 22 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| michael@0 | 23 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| michael@0 | 24 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| michael@0 | 25 | POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 26 | ***********************************************************************/ |
| michael@0 | 27 | |
| michael@0 | 28 | #ifdef HAVE_CONFIG_H |
| michael@0 | 29 | #include "config.h" |
| michael@0 | 30 | #endif |
| michael@0 | 31 | |
| michael@0 | 32 | #include "main.h" |
| michael@0 | 33 | |
| michael@0 | 34 | /* Decode parameters from payload */ |
| michael@0 | 35 | void silk_decode_parameters( |
| michael@0 | 36 | silk_decoder_state *psDec, /* I/O State */ |
| michael@0 | 37 | silk_decoder_control *psDecCtrl, /* I/O Decoder control */ |
| michael@0 | 38 | opus_int condCoding /* I The type of conditional coding to use */ |
| michael@0 | 39 | ) |
| michael@0 | 40 | { |
| michael@0 | 41 | opus_int i, k, Ix; |
| michael@0 | 42 | opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], pNLSF0_Q15[ MAX_LPC_ORDER ]; |
| michael@0 | 43 | const opus_int8 *cbk_ptr_Q7; |
| michael@0 | 44 | |
| michael@0 | 45 | /* Dequant Gains */ |
| michael@0 | 46 | silk_gains_dequant( psDecCtrl->Gains_Q16, psDec->indices.GainsIndices, |
| michael@0 | 47 | &psDec->LastGainIndex, condCoding == CODE_CONDITIONALLY, psDec->nb_subfr ); |
| michael@0 | 48 | |
| michael@0 | 49 | /****************/ |
| michael@0 | 50 | /* Decode NLSFs */ |
| michael@0 | 51 | /****************/ |
| michael@0 | 52 | silk_NLSF_decode( pNLSF_Q15, psDec->indices.NLSFIndices, psDec->psNLSF_CB ); |
| michael@0 | 53 | |
| michael@0 | 54 | /* Convert NLSF parameters to AR prediction filter coefficients */ |
| michael@0 | 55 | silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psDec->LPC_order ); |
| michael@0 | 56 | |
| michael@0 | 57 | /* If just reset, e.g., because internal Fs changed, do not allow interpolation */ |
| michael@0 | 58 | /* improves the case of packet loss in the first frame after a switch */ |
| michael@0 | 59 | if( psDec->first_frame_after_reset == 1 ) { |
| michael@0 | 60 | psDec->indices.NLSFInterpCoef_Q2 = 4; |
| michael@0 | 61 | } |
| michael@0 | 62 | |
| michael@0 | 63 | if( psDec->indices.NLSFInterpCoef_Q2 < 4 ) { |
| michael@0 | 64 | /* Calculation of the interpolated NLSF0 vector from the interpolation factor, */ |
| michael@0 | 65 | /* the previous NLSF1, and the current NLSF1 */ |
| michael@0 | 66 | for( i = 0; i < psDec->LPC_order; i++ ) { |
| michael@0 | 67 | pNLSF0_Q15[ i ] = psDec->prevNLSF_Q15[ i ] + silk_RSHIFT( silk_MUL( psDec->indices.NLSFInterpCoef_Q2, |
| michael@0 | 68 | pNLSF_Q15[ i ] - psDec->prevNLSF_Q15[ i ] ), 2 ); |
| michael@0 | 69 | } |
| michael@0 | 70 | |
| michael@0 | 71 | /* Convert NLSF parameters to AR prediction filter coefficients */ |
| michael@0 | 72 | silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 0 ], pNLSF0_Q15, psDec->LPC_order ); |
| michael@0 | 73 | } else { |
| michael@0 | 74 | /* Copy LPC coefficients for first half from second half */ |
| michael@0 | 75 | silk_memcpy( psDecCtrl->PredCoef_Q12[ 0 ], psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( opus_int16 ) ); |
| michael@0 | 76 | } |
| michael@0 | 77 | |
| michael@0 | 78 | silk_memcpy( psDec->prevNLSF_Q15, pNLSF_Q15, psDec->LPC_order * sizeof( opus_int16 ) ); |
| michael@0 | 79 | |
| michael@0 | 80 | /* After a packet loss do BWE of LPC coefs */ |
| michael@0 | 81 | if( psDec->lossCnt ) { |
| michael@0 | 82 | silk_bwexpander( psDecCtrl->PredCoef_Q12[ 0 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 ); |
| michael@0 | 83 | silk_bwexpander( psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 ); |
| michael@0 | 84 | } |
| michael@0 | 85 | |
| michael@0 | 86 | if( psDec->indices.signalType == TYPE_VOICED ) { |
| michael@0 | 87 | /*********************/ |
| michael@0 | 88 | /* Decode pitch lags */ |
| michael@0 | 89 | /*********************/ |
| michael@0 | 90 | |
| michael@0 | 91 | /* Decode pitch values */ |
| michael@0 | 92 | silk_decode_pitch( psDec->indices.lagIndex, psDec->indices.contourIndex, psDecCtrl->pitchL, psDec->fs_kHz, psDec->nb_subfr ); |
| michael@0 | 93 | |
| michael@0 | 94 | /* Decode Codebook Index */ |
| michael@0 | 95 | cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ psDec->indices.PERIndex ]; /* set pointer to start of codebook */ |
| michael@0 | 96 | |
| michael@0 | 97 | for( k = 0; k < psDec->nb_subfr; k++ ) { |
| michael@0 | 98 | Ix = psDec->indices.LTPIndex[ k ]; |
| michael@0 | 99 | for( i = 0; i < LTP_ORDER; i++ ) { |
| michael@0 | 100 | psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER + i ] = silk_LSHIFT( cbk_ptr_Q7[ Ix * LTP_ORDER + i ], 7 ); |
| michael@0 | 101 | } |
| michael@0 | 102 | } |
| michael@0 | 103 | |
| michael@0 | 104 | /**********************/ |
| michael@0 | 105 | /* Decode LTP scaling */ |
| michael@0 | 106 | /**********************/ |
| michael@0 | 107 | Ix = psDec->indices.LTP_scaleIndex; |
| michael@0 | 108 | psDecCtrl->LTP_scale_Q14 = silk_LTPScales_table_Q14[ Ix ]; |
| michael@0 | 109 | } else { |
| michael@0 | 110 | silk_memset( psDecCtrl->pitchL, 0, psDec->nb_subfr * sizeof( opus_int ) ); |
| michael@0 | 111 | silk_memset( psDecCtrl->LTPCoef_Q14, 0, LTP_ORDER * psDec->nb_subfr * sizeof( opus_int16 ) ); |
| michael@0 | 112 | psDec->indices.PERIndex = 0; |
| michael@0 | 113 | psDecCtrl->LTP_scale_Q14 = 0; |
| michael@0 | 114 | } |
| michael@0 | 115 | } |
